S3 Select (python) does not return the header when using WHERE clause despite FileHeaderInfo=NONE

Question

When I submit this query: SELECT * FROM s3object with the FileHeaderInfo of the input serialization set to NONE, I get the records expected with their header.

As soon as I add a where clause like this:

SELECT * FROM s3object  WHERE _3 = 'Chicago'

then the header is no longer returned.